KVM: VMX: Use wrmsr for switching between guest and host IA32_XSS on Intel
When the guest can execute the XSAVES/XRSTORS instructions, use wrmsr to set the hardware IA32_XSS MSR to guest/host values on VM-entry/VM-exit, rather than the MSR-load areas. By using the same approach as AMD, we will be able to use a common implementation for both (in the next patch). Reviewed-by: Jim Mattson <jmattson@google.com> Signed-off-by: Aaron Lewis <aaronlewis@google.com> Change-Id: I9447d104b2615c04e39e4af0c911e1e7309bf464 Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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@ -2081,13 +2081,6 @@ static int vmx_set_msr(struct kvm_vcpu *vcpu, struct msr_data *msr_info)
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if (data != 0)
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return 1;
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vcpu->arch.ia32_xss = data;
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if (vcpu->arch.xsaves_enabled) {
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if (vcpu->arch.ia32_xss != host_xss)
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add_atomic_switch_msr(vmx, MSR_IA32_XSS,
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vcpu->arch.ia32_xss, host_xss, false);
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else
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clear_atomic_switch_msr(vmx, MSR_IA32_XSS);
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}
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break;
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case MSR_IA32_RTIT_CTL:
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if ((pt_mode != PT_MODE_HOST_GUEST) ||
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@ -6473,6 +6466,22 @@ void vmx_update_host_rsp(struct vcpu_vmx *vmx, unsigned long host_rsp)
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}
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}
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static void vmx_load_guest_xss(struct kvm_vcpu *vcpu)
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{
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if (kvm_read_cr4_bits(vcpu, X86_CR4_OSXSAVE) &&
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vcpu->arch.xsaves_enabled &&
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vcpu->arch.ia32_xss != host_xss)
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wrmsrl(MSR_IA32_XSS, vcpu->arch.ia32_xss);
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}
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static void vmx_load_host_xss(struct kvm_vcpu *vcpu)
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{
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if (kvm_read_cr4_bits(vcpu, X86_CR4_OSXSAVE) &&
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vcpu->arch.xsaves_enabled &&
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vcpu->arch.ia32_xss != host_xss)
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wrmsrl(MSR_IA32_XSS, host_xss);
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}
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bool __vmx_vcpu_run(struct vcpu_vmx *vmx, unsigned long *regs, bool launched);
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static void vmx_vcpu_run(struct kvm_vcpu *vcpu)
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@ -6524,6 +6533,7 @@ static void vmx_vcpu_run(struct kvm_vcpu *vcpu)
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vmx_set_interrupt_shadow(vcpu, 0);
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kvm_load_guest_xcr0(vcpu);
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vmx_load_guest_xss(vcpu);
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if (static_cpu_has(X86_FEATURE_PKU) &&
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kvm_read_cr4_bits(vcpu, X86_CR4_PKE) &&
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@ -6630,6 +6640,7 @@ static void vmx_vcpu_run(struct kvm_vcpu *vcpu)
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__write_pkru(vmx->host_pkru);
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}
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vmx_load_host_xss(vcpu);
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kvm_put_guest_xcr0(vcpu);
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vmx->nested.nested_run_pending = 0;
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